Few questions.. It was probably asked before and i looked but couldnt find some answers... 1. I already have 2 rams of memory want 4 should i just buy 2 additional cheaper memory or go with 4 rams of the same cheap ram. Wonder it it makes a difference if the ram is the same company or if its mixed? 2. Which brand is the best for the new imacs? Except the original apple one? 3. Thanks !